Button click shows java.lang.null pointer exception in android

Question

I am trying to open an activity by pressing button activty contains 5 Edit-texts and 1 spinner when I press button it show unfortunately closing login.apk.

here is the code snippet of registartion .java

public class Registration extends Activity {
EditText name,password,email,dob,design,cpassword;
Button submit,cancel;
Spinner gender;
SQLiteDatabase db;
String Gen;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.registration);
    name=(EditText)findViewById(R.id.editText1);
    email=(EditText) findViewById(R.id.editText2);
    gender=(Spinner) findViewById(R.id.spinner1);
    dob=(EditText) findViewById(R.id.editText3);
    design=(EditText) findViewById(R.id.editText4);
    password=(EditText) findViewById(R.id.editText5);
    cpassword=(EditText) findViewById(R.id.editText6);

    db=openOrCreateDatabase("MobWalletDB",MODE_PRIVATE, null);
    List<String> list=new ArrayList<String>();
    list.add("Male");
    list.add("Female");
    ArrayAdapter<String> mAdapter= new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,list);
    mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    gender.setAdapter(mAdapter);

    submit.setOnClickListener(new View.OnClickListener() {

        public void onClick(View arg0) {

            MODELUserData userGivenDataObject=new MODELUserData(name.getText().toString()
                                                               ,email.getText().toString(),Gen,dob.getText().toString(),design.getText().toString(),password.getText().toString());

            if(QUERYUserReg.registerUser(db, userGivenDataObject)){
                Toast.makeText(getBaseContext(), "User Registered!!!", Toast.LENGTH_SHORT).show();
                startActivity(new Intent(Registration.this,Login.class));

            }else
                Toast.makeText(getBaseContext(), "Registration Failure!!!", Toast.LENGTH_SHORT).show();             

        }
    });

    gender.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View v, int in,
                long lg) {
            // TODO Auto-generated method stub
            Gen=parent.getItemAtPosition(in).toString();
        }
    });

}

}

and the Logcat shows the following errors

05-29 07:22:48.331: E/AndroidRuntime(13236): FATAL EXCEPTION: main05-29 07:22:48.331:     
E/AndroidRuntime(13236): java.lang.RuntimeException: Unable to start activity   ComponentInfo{com.example.login/com.example.login.Registration}: java.lang.NullPointerException
...
...

05-29 07:22:48.331: E/AndroidRuntime(13236): Caused by: java.lang.NullPointerException
05-29 07:22:48.331: E/AndroidRuntime(13236):    at com.example.login.Registration.onCreate(Registration.java:49)
05-29 07:22:48.331: E/AndroidRuntime(13236):    at android.app.Activity.performCreate(Activity.java:5104)
05-29 07:22:48.331: E/AndroidRuntime(13236):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
05-29 07:22:48.331: E/AndroidRuntime(13236):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
05-29 07:22:48.331: E/AndroidRuntime(13236):    ... 11 more

please tell me whats the error?
thanks in advance

Please post your code. The more information we have, the easier it is for us to find the problem. — knennigtri
– knennigtri, Commented May 29, 2013 at 7:35
if you got your answer then plz show some respect to ppl who helped you, at least single thanks??? — NaserShaikh
– NaserShaikh, Commented May 29, 2013 at 7:57

Ken Y-N · Accepted Answer · 2013-05-29 07:48:13Z

1

I believe the crash is here:

submit.setOnClickListener(new View.OnClickListener() {

You are missing a:

submit = (Button) findViewById(R.id.submit); // Or whatever your ID is

You also need to initialise cancel.

answered May 29, 2013 at 7:48

Ken Y-N

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Comments

Blackbelt · Accepted Answer · 2013-05-29 07:47:41Z

0

you never initialize submit. In Jave you can not declare and use an Object without create it (you should call the new operator upon it). Probably you missed the findViewById of submit

answered May 29, 2013 at 7:47

Blackbelt

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Comments

SKT · Accepted Answer · 2013-05-29 09:25:16Z

0

Initialize your submit and cancel buttons. You are writing onClickListener for a non-initialized variable

submit = (Button) findViewById(R.id.id_of_your_submit_button);
cancel= (Button) findViewById(R.id.id_of_your_cancel_button);

answered May 29, 2013 at 9:25

SKT

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Comments

PankajSharma · Accepted Answer · 2013-05-29 12:11:36Z

0

Your submit button id not inintialized on the Registration Activity.but u used onclick listener on submit button.so initialized it first.hope ur problem may be solved.

answered May 29, 2013 at 12:11

PankajSharma

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Comments

KyleMit · Accepted Answer · 2013-10-30 15:35:55Z

0

Try this code:

submit = (Button) findViewById(R.id.yourID);
Submit.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View arg0) {
        // your code here
    }
}

edited Oct 30, 2013 at 15:35

KyleMit♦

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answered Oct 30, 2013 at 15:16

Bishnu Kumar

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1 Comment

KyleMit Over a year ago

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